I should have done a TIL on this. When I was watching footage of the Queen's platinum jubilee and there was footage of Harry and Meghan arriving to St. Paul's cathedral, you could NOT miss in the background the Five Guys sign that was right across the street from the church. I don't know how long it's been there, but I know for sure it wasn't there the last time we were in London for the Saints game. We are going again this fall, but I'm not sure if we'll try international Five Guys (certainly not from the looks of this stupid long line).
https://restaurants.fiveguys.co.uk/greater-london/4-st-paul's-churchyard
Well, now, TIL that apparently the St. Paul's is London's 100TH Five guys.